/**
 * Moondance UML modeling tool
 * 
 * This program is free software; you can redistribute it and
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 3
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package ro.pub.cs.se.moondance.directedit;

import org.eclipse.jface.viewers.ICellEditorValidator;

import ro.pub.cs.se.moondance.model.VisibilityType;

/**
 * ICellValidator to validate direct edit values in the class label.
 * Collaborates with an instance of ValidationMessageHandler
 */
public class InterfaceNameCellEditorValidator implements ICellEditorValidator {

	private ValidationMessageHandler handler;

	/**
	 * @param validationMessageHandler
	 *            the validation message handler to pass error information to
	 */
	public InterfaceNameCellEditorValidator(
			ValidationMessageHandler validationMessageHandler) {
		this.handler = validationMessageHandler;
	}

	/**
	 * @param validation
	 *            of class name
	 * @return the error message if an error has occurred, otherwise null
	 */
	// visibility name
	public String isValid(Object value) {
		String name = (String) value;

		if (name.length() == 0) {
			String text = "Interface definition should include at least a name. The valid format is: visibility name.";
			return setMessageText(text);
		}

		String[] result = name.split("\\s");

		if (result.length ==2){// visibility name			
			if (!VisibilityType.contains(result[0])) {// visibility
				String text = "Invalid visibility type. Permissible types are: "
							+ VisibilityType.getTypes();
				return setMessageText(text);
			}
				
			if (ForbiddenIdentifierNames.contains(result[1])) {// name
				String text = "Interface name is an invalid identifier. Do not use java keywords as interface names.";
					return setMessageText(text);
			}
		}
		
	unsetMessageText();
	return null;
	}

	private String unsetMessageText() {
		handler.reset();
		return null;
	}

	private String setMessageText(String text) {
		handler.setMessageText(text);
		return text;
	}

}